Packing.



A. G. DANVER PACKING.

APPLICATION FILED JUNE 14, 1911.

' Patented MM, 1912.

v/zdrea/ UNITED STATES PATENT OFFICE.

AND BEW C. DANVER, OFP'ttOVIDENCE, RHODE ISLAND, ASSIGNOR OF ONE-HALF TOHARVEY J. FLINT, OF PROVIDENCE, RHODE ISLAND.

PACKING.

Specification of Letters Patent.

Application filed June 14, 1911.

Patented Mar. 5, 1912. Serial No. 633,163.

I '0 all whom it may concern;

Be it known that I Axnunw C. Daxvnu, a citizen of the United States,residing at the city of Providence, in the county of Providence andState of Rhode Island, have invented certain new and useful Improvementsin Packing, of which the following is a specification, rcference'beinghad therein to the accompanying drawing. 4

This invention relates to a valve stem packing and has for its object toprovide a packing constructed of a hellcally wound spring wire coveredwith a heavy coating of suitable anti-friction and heat resistingmaterial, said packing being particularly adapted to be readily appliedto a valve stem of internal combustion engines, and to antomaticallysupport itself in position thereon compensating for the reciprocatingaction of the valve.

Another ob'ect *of the invention is to provide this packing with anumber of open coils at its lower or outer end, the end of said opencoils being arranged to rest against' the cross bar or transverse key inthe valve stem whereby the upper portion of the packing is yieldinglvheld in position against the lower end of t e outer valve stem bearingto renderthis bearing tight after having been worn by the action of thevalve stem therein.

It is found in practice that by winding the packing in a helical form,each time the valve is opened by the raising of the stem, the packinghas a tendency (due to the spring action of the helically wound wire),to automatically engage the stem and also to press against the end ofthe bearing a little closer and so give to the packing its maximumeffectiveness at the time it is needed the most.

\Vith these and other objects in view, the invention consists of certainnovel features of construction, as will be more fully'described andparticularly pointed out in the appended claims.

In the accompanying drawings: Figure 1- is a sectional side elevationshowing a portion of an engine cylinder and a valve in position thereinand my improved packing iniscct'ion applied to the valve stem. Fig. 2-is a detail side elevation of my packing. Fig. 3 is a top view of saidpacking. Fig.

. 4-- is a section of the packing wire and coveri ng.

stem through which it extends.

Referring to the drawings 1 designates a portion of the valve casing ofany internal combustion engine, a portion of which casing is shown insection, and 2 the valve which is of the usual bevel seated type whichfinds its seat at 3 in said casing. The stem 4 in this class of valvesis usually formed integ al with the valve disk proper and projectsdownward through the elongated bearing 5, said stem being provided witha key or cross bar (5 which is adapted to be readily inserted or removedfrom the slot 7 in the The valve is normally held to its seat by meansof the large coil spring 8, one end of which rests against the casing at9 while the opposite end 10 rests against the said stem key 6 wherebythe valve is returned quickl to its seat after having been raised by t ecam (not shown.)

it is found in practice that owing to the continual and rapidreciprocations of the valve stem through its bearing 5 that this hearingwears and when the valve is raised permits a quantity of air to besucked in therethrough together with the explosive such an extent tlatoftentimes the charge will not ignite, thus causing much trouble .andgreatly reducing the efliciency of the engine. As some of the bearingswear more than others it is impossible to adjust the carburetor to suitthe different conditions under which each cylinder may be operating. Toobviate this difficulty I have pro= vidcd a simple and effective packingthe same being constructed in a rope form and having a core 11 of pianowire, or other suitable spring wire, said wire being covered as at 12with a thick coating of asbestos and graphite, or other suitableanti-friction and heat resisting material. This coatedwire is then woundin a helical form about a center arbor leaving a hole 15 therethrough alittle smaller than the valve stem to which the packing is to besubsequently applied, the coils at one end are closely laid as at 13,while those at the other end are wound apart or open as at 14, the openlaid coils forming a spring to hold the other coils in position. .Inapplying this packing to the stun it is only necessary to remove the key6 from the valve stem. Thisspiral packing is then readily applied to the'valve stem by turning the same on backward or in the opposite directionto that. in which the packing was originally wound. This turning of thepacking has a tendency to open the coils slightly and make the centerhole a little larger thereby enabling it to be read'ly pressed intoplace. The key 6 is then reinserted and the lower end 16 of the coilrests upon this key and exerts a .10 spring action upon the upper coils17 to firmly press them against the lower end of the'bearing 5 closingany opening'that may 20 of the coil to hug a little closer to the stem,

but also has a tendency to press the upper end 17 of the coil moreclosely against the lower end of bearing 5, thereby causing. thispacking to more completely close any opening which may exist between thestem 4 and its bearing at the time when it is most necessary for thevalve chamber to be tight.

' The device is extremely simple and inexpensive in construction, may bevery readily applied to any engine and is most effective in itsoperation rendering tight the worn valve stem bearing.

I claim: 1 i 1. As a new article of manufacture, a packing having acentral opening adapted to fit closely about a reciprocating valve stem,and a coil spring also about said stem. acting on said packing to holdit in position one end of said spring resting against a member carriedby said stem to reciprocate 40 therewith and adapted to tighten thepacking when the valve stem moves inward.

2. As a new article of manufacture, apacking having a comparatively softouter covering and a core of spring wire the same being wound into ahelical coil of close formationat one end and open formation at theopposite end whereby the latter end is adapted to rest against and movewith the reciprocations of the stem inclosed within the coil. 7 I

3. As a new article of manufacture, a packing having a comparativelysoft-outer covering and a core of spring wire, the same being wound intoa helical coil to fit around a reciprocating Valve stem, the coils atone end of the packing being wound in close formation and the coils atthe opposite end in open formation whereby the latter coils may serve asa spring to rest against a memher carried by said stem to reciprocatetherewith and yet retain the other coils in a fixed position.

In testimony whereof I affix my signature in presence of two witnesses.

ANDREW o nauvna.

Witnesses:

J OHN J. REILLY, S. C. PERRING.

